홈 게이트웨이에서의 입력 트래픽에 관한 적응적 대역폭 제어 시스템

최동희,김성훈,박홍성,Choi Dong-Hee,Kim Seong-Hoon,Park Hong-Seong 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.5b

이 논문은 VOD 서비스와 가전기기들의 제어가 가능한 홈 게이트웨이를 고려하였다. 홈 게이트웨이에서 출력 트래픽 제어를 통해 VOD 와 실시간 제어 데이터와 같은 입력 트래픽의 QoS를 보장하면서 CPU 연산 시간에 적게 영향을 줄 수 있는 PID 알고리즘 기반의 적응적 대역폭 제어 방법을 제안하였다. 제안하는 방법을 실제 테스트 환경에서 구현하여 검증하였다. This paper considers a home gateway(HG) that processes VOD services and controls home appliances. This paper proposes a PID algorithm-based adaptive bandwidth control method used in the HG, which guarantees QoS of incoming traffic such as VOD and real-time control data via control of outgoing traffic and have little effects on the CPU computation time. The proposed method is validated via implementation of real test environment.

인간 포배란의 유리화동결 융해 후 임신 및 분만에 관한 연구

최동희,정형민,정미경,이숙환,남윤성,박찬,곽인평,윤태기,Choi, Dong-Hee,Chung, Hyung-Min,Chung, Mi-Kyung,Lee, Sook-Hwan,Nam, Yoon-Seung,Park, Chan,Kwak, In-Pyung,Yoon, Tae-Ki 대한생식의학회 2000 Clinical and Experimental Reproductive Medicine Vol.27 No.4

Objective: This study was performed to evaluate whether vitrification method could be used for the cryopreservation of human blastocysts derived from IVF program. Methods: Surplus embryos were obtained from consented IVF patients. Controlled ovarian hyperstimulation was done with midluteal GnRH agonist, gonadotropin and hCG. After oocyte retrieval and insemination, fresh embryo transfer was done at $4{\sim}8$ cell stage. The surplus embryos after ET were cultured in blastocyst medium up to 6 days after oocyte retrieval. Obtained blastocysts were cryopreserved with our vitrification method. Blastocysts were exposed to 1.5 Methylene glycol (EG) in phosphate buffered saline (PBS) for 2.5 minutes, followed by 5.5 M EG plus 1 M sucrose for 20 seconds. Then 1 to 3 blastocysts were mounted on electron microscope (EM) grid and the grid was plunged into liquid nitrogen for storage. For thawing, blastocyst-containing EM grids were sequentially transferred in 1.0 M, 0.5 M, 0.25 M, 0.125 M and 0 M sucrose solution at the intervals of2.5 minutes. And blastocysts were cultured for about 6 hours and only re-expanded blastocysts were transferred to uterus of the patients on 4 to 5 days after ovulation in natural cycle or on 18 to 19 day of artificial cycle. Results: From Oct. 1998 to Jul. 1999, 34 patients were agreed to participate in this study. The mean age and duration of infertility of the patients were 31.6 years and 4.1 years, respectively. Among 34 cycles. replacements could be done in 20 cycles (58.8%). A total 93 blastocysts were thawed and 48 (51.6%) of them survived. Thirty-eight blastocysts, mean 1.9 embryos per patient, were transferred, resulting in 5 clinical pregnancies which consisted of 1 triplet, 2 sets of twins and 2 singleton pregnancies. The pregnancy rate per transfer was 25% and implantation rate was 23.6%. Five patients delivered 7 healthy babies including 2 sets of twins at term. Conclusion: Successful pregnancies and deliveries were established after transfer of vitrified human blastocysts. Vitrification using ethylene glycol as cryoprotectant and electron microscope grid is a rapid and simple method that can be effectively applied for the cryopreservation of human blastocysts.

CMMI 기반 프로세스 지원 시스템 설계

최동희,Choi, Dong-Hee 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.3

In this paper, I have proposed a design of process support system based on CMMI process which can support integrated management and repository for CMMI model processes. The system assists small organization to improve business process and offers institutionalized automatic environment to users for use of CMMI processes. The proposed system also can enhance quality and productivity of project by including features such as convenience of project management, planned project administration and steady process improvement.

족삼리(足三里), 합곡(合谷) 침자(鍼刺)가 상치(上齒), 하치부(下齒部) 동통(疼痛) 억제(抑制)에 미치는 영향(影響)

최동희,김원재,나창수,Choi Dong-Hee,Kim Won-Jae,Na Chang-Su 경락경혈학회 2001 대한침구의학회지 Vol.18 No.1

The pain was induced on upper and lower incisor of the rat based on the theory of 'connections of upper incisor pain with stomach meridian and lower incisor pain with large intestine meridian'. Such acupoints as ST36 and LI4 were used for alleviation of upper and lower incisor pain. The digastric myogram (dEMG) was utilized for the pain measurement. The upper incisor pain was gradually decreased during ST36 stimulation and significant differences were observed at 20 and 25 minute point during 60 minutes study. The upper incisor pain was gradually decreased during LI4 acupuncture and 20 minute was the only point that showed a significant difference. The alleviation of lower incisor pain was not obvious during the ST36 acupuncture. The lower incisor pain was gradually decreased during LI4 stimulation with significant differences at 15, 20 and 40 minute point. In conclusion, the upper incisor pain was relieved with ST36 and LI4 acupuncture while LI4 was effective on the lower incisor pain alleviation based on the theory of 'connections of upper incisor pain with stomach meridian and lower incisor pain with large intestine meridian'.

접근제어 정책구현을 위한 역할기반 XML 암호화

최동희(Dong-Hee Choi),박석(Seog Park) 한국정보보호학회 2005 정보보호학회논문지 Vol.14 No.1

XML문서가 웹 문서의 표준으로 자리잡음에 따라 많은 정보들이 XML문서의 형식으로 표현되면서 XML문서의 보안에 관한 요구도 커지고 있다. XML문서의 보안은 암호화, 전자서명, 키 관리, 접근제어에 관한 연구가 활발히 이루어지고 있다. 현재까지의 XML보안에 관한 연구는 암호화와 전자서명 같은 통신상의 보안에 관한 연구가 중심이 되었으나, XML문서가 방대해지고 복잡해짐에 따라 XML문서에 대한 통신상의 보안 뿐 아니라 관리적인 보안이 필요하게 되었다. 이러한 관리적인 보안은 접근제어를 통해 보장할 수 있다. 하지만 XML문서의 암호화는 단순한 통신상의 보안만을 제공할 뿐 관리적 보안 요소인 다양한 사용자와 다양한 접근권한 정책을 반영하지 못하고 있다. 본 논문에서는 XML문서의 보안을 위해 역할별 권한정책을 반영한 접근제어를 보장하는 주체기반 암호화 기법을 제안한다. 접근제어를 보장하는 암호화를 수행함으로써 다양한 사용자의 다양한 권한정책을 반영할 수 있다. 또한 제안하는 암호화 기법은 전처리 과정을 이용하여 기존의 접근제어 기법의 복잡한 접근 권한 평가 비용을 줄일 수 있다. As a large quantity of information is presented in XML format on the web, there are increasing demands for XML security. Research area of XML security is about Encryption, Digital Signature, Key management and Access Control. Until now research on XML security has been focused on the security of data network using digital signature and encryption technology. As XML data become extensive and complex XML security comes to involve not only network security but also managerial security. Managerial security is guaranteed through access control. But XML Encryption supports simple network security. So it can't support multiple users and multiple access control policies. In this paper, we propose an integration method of encryption and access control policy for securing XML documents. This methodology can support multiple authorizations of multiple users with integrating access control. And this can reduce the cost of evaluation process of the existing complicated access authorization with pre-processing.

지연시간 보장을 위한 향상된 CBQ 정책

최동희(Dong Hee Choi),신혜민(Hye Min Shin),김성훈(Seong Hoon Kim),박홍성(Hong Sung Park) 한국통신학회 2005 한국통신학회 학술대회 및 강연회 Vol.2005 No.4

서비스 레지던스의 호텔시장 진출에 대한 관광산업 이해집단 간 영향지각 차이에 관한 연구

최동희(Dong Hee Choi),김홍범(Hong Bum Kim) 한국호텔외식관광경영학회 2010 호텔경영학연구 Vol.19 No.1

This study was aimed to investigate the effects of service residences on tourism industry in Korea along with their entry into the market of hotel industry through the staff of tourism accommodation industry-related interest groups such as hotels, service residences, travel agencies, local self-governing bodies (hereinafter referred to as `LSGBs`) in charge of tourism policies. It has been assumed that service residences have contributed to the development of tourism industry in Korea by serving as a cultural place like a hotel, supplementing the insufficient guest rooms in Korean hotels, activating regional economy and becoming a catalyst of the development of tourism industry through the improvement in the image of Korean tourism. On the other hand, it has been believed that those working for hotels were concerned about the possible decline in the overall amount of hotel sales due to the reckless entry into the market by service residences and there would be more severe sales decline in special second-class hotels than in special first-class hotels and in local hotels than in chain hotels. It has been expected that travel agencies and LSGBs would play a role in mediating the conflicts above. However, the travel agencies showed similar opinions to service residences in their position of consuming the products of guest rooms, whereas LSGBs held the same position as hotels. This demonstrated that there were no clear judicial regulations in LSGBs regarding the service residences even if LSGBs had responsibilities for the management and supervision of the operation of service residences, thus having mostly negative opinions about their entry into the market.

호텔 종사자의 조직 갈등이 소진에 미치는 영향

최동희(Dong Hee Choi),김홍범(Hong Bumm Kim) 한국호텔외식관광경영학회 2012 호텔경영학연구 Vol.21 No.2

The purpose of this study is to examine the possible effects of organizational conflicts on burnouts. For the survey, ten hotels were selected, considering the total number of franchise and local hotels among the deluxe hotels located in Seoul. A total of 358 survey responses were analyzed by regression analysis in order to investigate the causal relationships presumed in the question by hotel employees, who worked at deluxe hotels in the room, food and beverage, and back-office management divisions. The results suggested that among organizational conflicts, reward conflict, goal conflict, vertical conflict, and role conflict significantly affected emotional depletion in employees` burnout dimension. Role conflict, horizontal conflict and decision conflict, on the other hand, appeared to affect depersonalization in burnout. The result of the study confirmed that the burnout due to emotional labor was escalated to a widespread burnout phenomenon by intra-organizational conflict. In order to prevent this, it is important to plan and operate various educational programs to alleviate the organizational conflicts as well as a relation-reinforcing program to form positive relationships among hotel employees. The limitations of the study will prove the effect of the control variable of hotel size, an important exogenous variable that can secure representativeness while influencing the study by analyzing the moderating effect of hotel size.

접근제어 정책 구현을 위한 주체기반 XML 암호화

최동희(Dong-Hee Choi),박석(Seog Park) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.2004 No.5

실험과 CFD를 활용한 건물 내 미세먼지 재부유 및 확산해석 방법

최동희(Choi, Dong-Hee),강동화(Kang, Dong-Hwa) 대한건축학회 2013 대한건축학회논문집 Vol.29 No.10

The objective of the study is to develop methodology to evaluate particle resuspension and dispersion in building environment. Experimental chamber system to measure particle resuspension rates from reservoir materials was suggested. The resuspension chamber was designed to provide both aerodynamic disturbance and mechanical disturbance to cause particle resuspension. The particle disperser chamber system was also suggested for preparation of dust loaded reservoirs. The results from the chamber experiment showed that the resuspension chamber system can characterize resuspension rates of quartz from stainless steel plate, carpet and linoleum. It also showed that particle resuspension rates differ from reservoir materials to materials. For evaluation of indoor particle dispersion, computational fluid dynamics (CFD) technique based on Lagrangian method was suggested. The CFD model was validated by comparing the simulated results with the experimental data including the distribution of indoor particle concentration